What is the troposphere of altitude range in km and miles?

The troposphere, the lowest layer of Earth's atmosphere, extends from the surface up to an altitude of about 8 to 15 kilometers (5 to 9 miles), varying with latitude and weather conditions. It is generally thicker at the equator and thinner at the poles. This layer is where most of the Earth's weather occurs and contains roughly 75% of the atmosphere's mass.